Method and equipment for manufacturing light guide plate and light guide plate therewith

ABSTRACT

In a backlight module, a diffusive structure and a prism structure are replaced by a diffusive prism film formed on a substrate and transferred via In-Mold Decoration by Roller (IMR) to a light guide body via injection molding. A reflection film is also transferred to an opposite side of the light guide body via the same way. In such way, optical films may be readily transferred to the light guide body via two-side IMR during the process of injection molding of the light guide body, saving room taken by substrates of the optical components.

BACKGROUND

1. Field

The disclosure relates to a method and equipment for manufacturing alight guide plate, and more particularly, to a light guide plate, amethod, and an equipment for manufacturing the light guide plate thatintegrates a diffusive prism film on the light guide body.

2. Description of the Prior Art

A conventional backlight module includes a variety of components. Whenlights is generated by a source like the LED module or the CCFL module,it travels between each optical component and a Fresnel loss may happenwhere reflection occurs at the boundaries of the medium, and accordinglythe overall efficiency of the backlight module will be compromised.Improvement to the panel or the backlight module is necessary so thatthe optical quality at the front side of the display is acceptable.

Compared with the panel module, the backlight module has more to beimproved, as the fact that the light source is disposed therein andfewer optical components exist in the backlight module than in the panelmodule.

On the other hand, in pursuit of the improvement on the thickness of aflat panel display, the key concern is about to reduce the thickness ofthe backlight module. Currently, one can always find a reflective plate,a light guide plate, a diffusive plate, and a prism plate stacking inorder as the necessary components for a backlight module, whereas thelight source is disposed at a side of the light guide plate for anedge-type backlight module. The light guide plate guides the travellinglights from a side source to a plane source, the diffusive plate putsthe diffusion effect on the lights emitting from the light guide plate,and the prism plate further aligns the scatter-like lights from thediffusive plate to travel in one direction via the refraction of prismsthereon and also concentrates the lights.

These components are indispensable for a conventional backlight moduleand they take up a certain amount of thickness of the backlight module.This places a limit to the improvement on the thickness of a flat paneldisplay and to the improvement of the light efficiency of a backlightmodule.

SUMMARY OF THE DISCLOSURE

To provide a lighter and thinner backlight module, so that thelimitation caused by the nature of a conventional backlight module maybe properly dealt with, embodiments of the disclosure provide a lightguide plate with micro structures processed via two-side in-molddecoration, and a method and an equipment for manufacturing such lightguide plate.

An embodiment of the disclosure provides a method for manufacturing alight guide plate. The method includes following steps: forming adiffusive prism film on a substrate, attaching the diffusive prism filmand the substrate to a first mold and using a first pressing frame forclamping edges of the diffusive prism film, injecting plastics into amold cavity formed between the first mold and a second mold for forminga light guide body, and separating the light guide body from the firstmold and the second mold. When the light guide body is separated fromthe first mold, the diffusive prism film is transferred onto a firstsurface of the light guide body such that a light guide plate is formed.

In the method for manufacturing a light guide plate of the disclosure,the step of forming a diffusive prism film on a substrate includesfollowing steps: forming micro structures on the substrate via hotembossing, coating a de-bonding layer on the substrate, coating adecorative film on the de-bonding layer and forming micro structures onthe decorative film wherein the decorative film contains diffusiveparticles, and coating an adhesive layer on the decorative film, whileseparating the light guide body from the first mold and the second moldincludes separating the substrate and the de-bonding layer from thedecorative film of the diffusive prism film.

In the method for manufacturing a light guide plate of the disclosure,the step of forming a diffusive prism film on a substrate includesfollowing steps: coating a consolidated layer on the substrate, formingmicro structures on the consolidated layer via hot embossing andconsolidating the consolidated layer, coating a decorative film on theconsolidated layer and forming micro structures on the decorative filmwherein the decorative film contains diffusive particles, and coating anadhesive layer on the decorative film, while separating the light guidebody from the first mold and the second mold includes separating thesubstrate and the consolidated layer from the decorative film of thediffusive prism film.

In the method for manufacturing a light guide plate of the disclosure,the first mold includes a channel and a sprue connected between thechannel and the mold cavity. The pore size of the sprue is greater thanthe pore size of the channel. The substrate and the diffusive prism filminclude a through hole corresponding to the location of the sprue. Thefirst pressing frame includes an isolating part corresponding to thelocation of the sprue. The isolating part includes a convex pore. Themethod further includes step: when the first pressing frame is clampingthe edges of the diffusive prism film, disposing the isolating part ofthe first pressing frame at the sprue for connecting the convex pore tothe channel and positioning the isolating part between the sprue and thethrough hole.

The method for manufacturing a light guide plate of the disclosurefurther includes following step: attaching a reflective film to thesecond mold and using a second pressing frame for clamping edges of thereflective film, and when the light guide body is separated from thesecond mold, the reflective film is transferred onto a second surface ofthe light guide body.

In another embodiment, the disclosure provides an equipment formanufacturing a light guide plate. The equipment includes a first mold,a second mold, and a first pressing frame. The first mold includes achannel and a sprue having pore size greater than the pore size of thechannel. The second mold is assembled with the first mold such that amold cavity is formed therebetween. The sprue of the first mold isconnected between the channel and the mold cavity. The first pressingframe is adapted for being assembled to the first mold so as to clamp atransfer film to the first mold. The first pressing frame includes anisolating part corresponding to the location of the sprue. The isolatingpart includes a convex pore and is disposed at the sprue and the convexpore connected to the channel.

The equipment provided by the embodiment of the disclosure furtherincludes a second pressing frame adapted for being assembled to thesecond mold so as to clamp a transfer film to the second mold.

In still another embodiment, the disclosure provides a light guide plateincluding a light guide body and a diffusive prism film. The light guidebody has a first surface and a second surface. The diffusive prism filmcontains diffusive particles and includes an adhesive layer attached tothe first surface of the light guide body via In-Mold Decoration byRoller (IMR). The diffusive prism film also includes micro structures ona surface opposite to the adhesive layer.

The light guide plate provided by the embodiment of the disclosurefurther includes a reflective film attached to the second surface of thelight guide body via In-Mold Decoration by Roller (IMR) and the microstructures on the surface of the diffusive prism film are isoscelesright triangular prisms.

The light guide plate, the method and the equipment for manufacturingthe light guide plate of the disclosure provide embodiments to implementa diffusive prism film in replacement of a diffusive structure and aprism structure. The diffusive prism film is formed on a substrate andtransferred via In-Mold Decoration by Roller (IMR) to a light guide bodyvia injection molding. The reflection film is also transferred to theopposite side of the light guide body via the same way. In such way,optical films may be readily transferred to the light guide body viatwo-side IMR during the process of injection molding of the light guidebody, saving room taken by substrates of the optical componentsnecessary for a conventional backlight module and also reducing theoverall thickness of each key light guiding components in the backlightmodule.

These and other objectives of the present disclosure will no doubtbecome obvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a light guide plate (LGP) incorporated withdiffusive prism film according to the disclosure.

FIG. 2 is an illustration showing an embodiment of a method of formingthe diffusive prism film of the light guide plate.

FIG. 3 is an illustration showing another embodiment of a method offorming the diffusive prism film of the light guide plate.

FIG. 4 is an illustration of an equipment for manufacturing a lightguide plate, a light guide plastics, and a transfer film.

FIG. 5 is an illustration showing the first mold, the second mold, thetransfer film, and the reflective film before the process of two-sidein-mold decoration.

FIG. 6 is an illustration showing a status that the transfer film andthe reflective film are respectively attached to the first mold and thesecond mold for the two-side in-mold decoration.

FIG. 7 is an illustration showing a plastic injection region of thefirst pressing frame and the transfer film.

FIG. 8 is an illustration of a side sectional view of the plasticinjection region of the first mold.

FIG. 9 is an illustration showing a perspective sectional view of theplastic injection region of the first mold.

FIG. 10 is an illustration of the equipment with the transfer filmattached therein and a mold cavity formed therein for injection ofplastics.

FIG. 11 is an illustration of an enlarged view of area A in FIG. 10.

FIG. 12 is an illustration of a flow chart of a method for manufacturinga light guide plate according to the disclosure.

FIG. 13 is an illustration showing every stages of how the diffusiveprism film is made and transferred onto the light guiding body accordingto the method in FIG. 2.

FIG. 14 is an illustration showing every stages of how the diffusiveprism film is made and transferred onto the light guiding body accordingto the method in FIG. 3.

DETAILED DESCRIPTION

Please refer to FIG. 1. FIG. 1 is an illustration of a light guide plate(LGP) incorporated with diffusive prism film according to thedisclosure. A light guide plate 60 includes a light guide body 62, adiffusive prism film 65, and a reflective film 68. The light guide body62 is a light-transmittable acrylic plate or polycarbonate (PC) plate,which has a first surface 621 and a second surface 622. To reduce abacklight module's overall thickness while keeping or enhancing thelight conductivity of the backlight module, the light guide plate 60 hasthe diffusive prism film 65 disposed on the first surface 621 and thereflective film 68 disposed on the second surface 622. The diffusiveprism film 65 includes a decorative film 64 and an adhesive layer 66.The adhesive layer 66 is attached to the first surface 621 of the lightguide body 62 via In-Mold Decoration by Roller (IMR) and the reflectivefilm 68 may be attached to the second surface 622 of the light guidebody 62 also via In-Mold Decoration by Roller (IMR).

A surface of the decorative film 64, which is a surface of thedecorative film 64 opposite to the adhesive layer 66, micro structures641 like isosceles right triangular prisms are disposed thereon. Thediffusive prism film 65 contains diffusive particles. The reflectivefilm 68 is adapted to guide lights entering the light guide body 62 andgoing toward the second surface 622 and reflect the lights toward thefirst surface 621 of the light guide body 62 and the diffusive prismfilm 65. In other words, the light guide plate 60 provided by thedisclosure in FIG. 1 has a hybrid structure composed by a light guideplate as a conventional meaning, a diffusive plate for diffusing lightsfrom the light guide plate, a prism plate for guiding and concentratingthe diffused lights from the diffusive plate, and a reflective plate forreflective lights. Such hybrid structure of the light guide plate 60provides notably reduction in overall thickness of the module.

Please refer to FIG. 2. FIG. 2 is an illustration showing an embodimentof a method of forming the diffusive prism film of the light guideplate. In the disclosure, the diffusive prism film is manufactured inthe first place, formed as a thin film on a substrate via printingtechnique. The film-like diffusive prism film has micro structures fordiffusive purpose. It will be further transferred to the light guidebody using In-Mold Decoration by Roller (IMR) technique. The method 100of forming the diffusive prism film includes following steps:

Step 102: Forming micro structures on a substrate via hot embossing;

Step 104: Coating a de-bonding layer on the substrate;

Step 106: Coating a decorative film on the de-bonding layer, formingmicro structures on the decorative film, and adding diffusive particlesto the decorative film;

Step 108: Coating an adhesive layer on the decorative film.

The micro structures 641 are formed on the diffusive prism film 65 byuse of the substrate as a medium. Please refer to FIG. 13 together,which includes an illustration of the diffusive prism film 65 and anyintermediate diagrams of the diffusive prism film 65 during the processimplemented with the method 100 in FIG. 2. In Step 102, micro structures72 are formed on a substrate 70 via hot embossing in the first place.The micro structures 72 may be preferably three-dimensional parts likeisosceles right triangular prisms, processed on the substrate 70 via hotembossing, a simple and cost efficient way. The substrate 70 may be PCplastics or PET plastics with preferable thickness between 0.025 mm and0.1 mm.

Next in Step 104, a de-bonding layer 74 is coated on the surface of themicro structures 72 of the substrate 70 and the de-bonding layer 74consequently built up shape with the micro structures 72. In Step 106,the decorative film 64 is coated on the de-bonding layer 74;practically, plastic resin is coated thereon and dried in shape. Theproximity of the decorative film 64 to the surface of the de-bondinglayer 74 makes up micro structures 641 on the decorative film 64 incorrespondence with the shape of the de-bonding layer 74. Addingdiffusive particles to the diffusive prism film 65 makes the diffusiveprism film 65 diffusible for lights.

Last in Step 108, an adhesive layer 66 is coated on the decorative film64 so that the decorative film 64 may be fixedly attached to an targetobject during the later IMR process. The adhesive layer 66 may bepreferably using reactive thermoplastic polyurethane, reactiveaminovite, UV bridging resin, or reactive silicon gel. Additionally, thesubstrate 70, the de-bonding layer 74, the decorative film 64, and theadhesive layer 66 make up a transfer film 80.

Please refer to FIG. 3. FIG. 3 is an illustration showing anotherembodiment of a method of forming the diffusive prism film of the lightguide plate. Another method may be implemented to form the transfer film80. A method 200 of forming the diffusive prism film includes followingsteps:

Step 202: Coating a consolidated layer on a substrate;

Step 204: Forming micro structures on the consolidated layer via hotembossing and consolidating the consolidated layer;

Step 206: Coating a decorative film on the consolidated layer, formingmicro structures on the decorative film, and adding diffusive particlesto the decorative film;

Step 208: Coating an adhesive layer on the decorative film.

Please refer to FIG. 14 together, which includes an illustration of thediffusive prism film 65 and any intermediate diagrams of the diffusiveprism film 65 during the process implemented with the method 200 in FIG.3. In Step 202, resin is coated on the surface of the substrate 70 as aconsolidated layer 76, which is a 20 μm thick, unhardened film.

Next in Step 204, micro structures 78 are formed on the unhardenedconsolidated layer 76 via screen printing or rolling embossing by usinga roller having micro structures, and in the mean time, the consolidatedlayer 76 is being hardened under the process of UV irradiation orroasting. In Step 206, the decorative film 64 is coated on theconsolidated layer 76; practically, plastic resin is coated thereon anddried in shape. The proximity of the decorative film 64 to the surfaceof the consolidated layer 76 makes up micro structures 641 on thedecorative film 64 in correspondence with the shape of the consolidatedlayer 76. Adding diffusive particles to the diffusive prism film 65makes the diffusive prism film 65 diffusible for lights.

Last in Step 208, an adhesive layer 66 is coated on the decorative film64 so that the decorative film 64 may be fixedly attached to an targetobject during the later IMR process. Additionally, the substrate 70, theconsolidated layer 76, the decorative film 64, and the adhesive layer 66make up a transfer film 80.

Please refer to FIG. 4. FIG. 4 is an illustration of an equipment formanufacturing a light guide plate, a light guide plastics, and atransfer film. The disclosure provides a way of manufacturing the lightguide plate using equipment with In-Mold Decoration by Roller (IMR). InFIG. 4, an equipment 10 includes a first mold 20, a second mold 30, afirst pressing frame 40, and a second pressing frame 50. The equipment10 with two-side in-mold decoration is adapted to transfer thereflective film 68 and the diffusive prism film 65 onto the light guidebody 62, whereas one-side in-mold transfer is also an available optionby implementing such equipment 10 to transfer the diffusive prism film65 or the reflective film 68 onto the light guide body 62 in the processof manufacturing the light guide plate. FIG. 4 shows a relative positionbetween the first mold 20, the transfer film 80 including the diffusiveprism film 65, the first pressing frame 40, the light guide body 62, thesecond pressing frame 50, and the second mold 30.

Please refer to FIG. 5 and FIG. 6. FIG. 5 is an illustration showing thefirst mold 20, the second mold 30, the transfer film 80, and thereflective film 68 before the process of two-side in-mold decoration.FIG. 6 is an illustration showing a status that the transfer film 85 andthe reflective film 68 are respectively attached to the first mold 20and the second mold 30 for the two-side in-mold decoration.

Please refer to FIG. 7 to FIG. 11. FIG. 7 is an illustration showing aplastic injection region of the first pressing frame 40 and the transferfilm 80, FIG. 8 is an illustration of a side sectional view of theplastic injection region of the first mold 20, FIG. 9 is an illustrationshowing a perspective sectional view of the plastic injection region ofthe first mold 20, FIG. 10 is an illustration of the equipment with thetransfer film attached therein and a mold cavity formed therein forinjection of plastics, and FIG. 11 is an illustration of an enlargedview of area A in FIG. 10.

In the process of two-side in-mold decoration injection, the equipment10 prevents the plastics with high temperature and high pressure at theentrance of the first mold 20 from direct contact with the transfer filmthat could damage the transfer film. This is achieved by the specificstructure of the first pressing frame 40 that provides a protection tothe part of transfer film 80 at the sprue.

FIG. 10 shows that a mold cavity 12 will be formed when the first mold20 and the second mold 30 are assembled. FIG. 9 shows that the firstmold 20 includes a channel 22 and a sprue 24 connected between thechannel 22 and the mold cavity 12. In the embodiment, the pore size ofthe sprue 24 is greater than the pore size of the channel 22. As thetransfer film 80 and the reflective film 68 are respectively attached tothe first mold 20 and the second mold 30 through vacuum suction as shownin FIG. 6, FIG. 10 further shows that the first pressing frame 40 isassembled to the first mold 20 so as to clamp the transfer film 80 tothe first mold 20, while the second pressing frame 50 is assembled tothe second mold 30 so as to clamp a transfer film, the reflective film68 in this embodiment, to the second mold 30. The second pressing frame50 and the reflective film 68 may also be omitted in embodiments ofone-side in-mold decoration. In still another embodiments, the transferfilm 80 may be disposed at the second mold 30 and be clamped by thesecond pressing frame 50 to the second mold 30, whereas the first frame40 is omitted.

In FIG. 7, the transfer film 80 has a through hole 82 located near thelocation of the sprue 24 giving a way for plastics may be injected intothe mold cavity 12 from the sprue 24. Since part of the transfer film 80is near the sprue 24 in the equipment 10, when the plastics is injectedfrom the sprue 24, the wash effect may be caused by the plastics towardthe transfer film 80, and the high temperature of the plastics maydamage the transfer film 80. Hence, the first pressing frame 40 includesan isolating part 42 corresponding to the location of the sprue 24 andthe isolating part 42 has a convex pore 44 designed for protecting thetransfer film 80 from being damaged.

As shown in FIG. 8, FIG. 9, and FIG. 11, the first mold 20 has aconcaved part 26 surrounding the sprue 24 and when the first pressingframe 40 is assembled with the first mold 20, the isolating part 42 ofthe first pressing frame 40 fits into the concaved part 26 and isdisposed at the sprue 24, whereas the convex pore 44 is connected to thechannel 22, which is shown in FIG. 11. As the isolating part 42 fitsinto the concaved part 26, the isolating part 42 has passed through thethrough hole 82 of the transfer film 80 in that the transfer film 80 maybe isolated from the plastics passing through the sprue 24, keeping awaythe direct wash and damage from the plastics to the transfer film 80.Additionally, the second mold 30 includes a well 32 corresponding to thelocation of the sprue 24, providing a buffer for the plastics.

Please refer to FIG. 12. FIG. 12 is an illustration of a flow chart of amethod for manufacturing a light guide plate according to thedisclosure. A method 300 for manufacturing the light guide plateincludes following steps:

Step 302: Forming a diffusive prism film on a substrate;

Step 304: Attaching the diffusive prism film and the substrate to afirst mold and using a first pressing frame for clamping edges of thediffusive prism film;

Step 305: Attaching a reflective film to a second mold and using asecond pressing frame for clamping edges of the reflective film;

Step 306: Injecting plastics into a mold cavity formed between the firstmold and the second mold for forming a light guide body;

Step 308: Separating the light guide body from the first mold and thesecond mold.

The method 300 utilizes equipment 10 with two-side in-mold decorationfeature that can transfer films on both sides of the a light guide bodyso as to integrate the reflective component, the light guide body, thediffusive component, and the prism component of a backlight module intoa single component. In Step 302, the process of making the diffusiveprism film 65, such as the diffusive prism film 65 incorporated with thesubstrate 70 as a transfer film 80, may be referred to the method 100 ormethod 200 in FIG. 2 or FIG. 3, which provide details of making thetransfer film 80.

After the diffusive prism film 65, having features of both a diffusiveplate and a prism plate, is formed on the substrate 70, the transferfilm 80 and the reflective film 68 are respectively attached to themolds and clamped by the pressing frames as provided in Step 304, Step305, also in FIG. 5 and FIG. 6. Step 305 may also be omitted forone-side in-mold decoration process.

Next in Step 306, plastics is injected into the mold cavity 12 formed bythe first mold 20 and the second mold 30, during which process, thelight guide body 62 is formed therein and the transfer film 80 and thereflective film 68 on the first mold 20 and the second mold 30 arerespectively transferred onto the sides of the light guide body 62 sothat a light guide plate 60 is formed. It should be noted that in Step304, as the first pressing frame 40 is clamping the edges of thediffusive prism film 65, the isolating part 42 of the first pressingframe 40 is disposed to correspond the sprue 24 of the first mold 20 andthe convex pore 44 of the isolating part 42 has connection with thechannel 22 of the first mold 20, positioning the isolating part 42between the sprue 24 and the through hole 82 of the transfer film 80.

Please also refer to FIG. 13 and FIG. 14. FIG. 13 is an illustrationshowing every stages of how the diffusive prism film is made andtransferred onto the light guiding body according to the method in FIG.2, and FIG. 14 is an illustration showing every stages of how thediffusive prism film is made and transferred onto the light guiding bodyaccording to the method in FIG. 3. The steps of how to form thediffusive prism film are described in previous paragraphs.

In Step 308, as the light guide plate 60 is separated from the firstmold 20 and the second mold 30, the de-bonding layer 74 or theconsolidated layer 76 of the transfer film 80 allows detachment of thediffusive prism film 65 from the substrate 70, i.e., the diffusive prismfilm 65 will be transferred onto the first surface 621 of the lightguide body 62. For two-side in-mold decoration process, the reflectivefilm 68 on the second mold 30 will also be transferred onto the secondsurface 622 of the light guide body 62.

The disclosure uses printing technique to produce on the substrate 70the diffusive prism film 65 with diffusiveness and light-guiding microstructures first, and then transfer the diffusive prism film 65 onto thelight guide body 62. The equipment 10 for manufacturing such light guideplate 60 makes use of two-side in-mold decoration by Roller (IMR) totransfer the diffusive prism film 65 and the reflective film 68 ontoboth sides of the light guide body 62 at the same time, therebyproducing a component having reflective, light guiding, diffusive, andprism-like features all in one piece of module, saving most substratesused in a conventional backlight module and extensively reducing theoverall thickness of the optical module. The structure of the disclosurealso provides shortest path for lights to travel to the panel with leastconsumption of lights.

Regarding the light guide plate, the method and the equipment formanufacturing the light guide plate, the disclosure provides embodimentsto implement a diffusive prism film in replacement of a diffusivestructure and a prism structure. The diffusive prism film is formed on asubstrate and transferred via In-Mold Decoration by Roller (IMR) to alight guide body via injection molding. The reflection film is alsotransferred to the opposite side of the light guide body via the sameway. In such way, optical films may be readily transferred to the lightguide body via two-side IMR during the process of injection molding ofthe light guide body, saving room taken by substrates of the opticalcomponents necessary for a conventional backlight module and alsoreducing the overall thickness of each key light guiding components inthe backlight module.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the disclosure. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A method for manufacturing a light guide plate,comprising following steps: forming a diffusive prism film on asubstrate; attaching the diffusive prism film and the substrate to afirst mold and using a first pressing frame for clamping edges of thediffusive prism film; injecting plastics into a mold cavity formedbetween the first mold and a second mold for forming a light guide body;and separating the light guide body from the first mold and the secondmold; wherein when the light guide body is separated from the firstmold, the diffusive prism film is transferred onto a first surface ofthe light guide body such that a light guide plate is formed.
 2. Themethod of claim 1, wherein forming a diffusive prism film on a substratecomprising following steps: forming micro structures on the substratevia hot embossing; coating a de-bonding layer on the substrate; coatinga decorative film on the de-bonding layer and forming micro structureson the decorative film, wherein the decorative film contains diffusiveparticles; and coating an adhesive layer on the decorative film.
 3. Themethod of claim 2, wherein separating the light guide body from thefirst mold and the second mold comprising: separating the substrate andthe de-bonding layer from the decorative film of the diffusive prismfilm.
 4. The method of claim 3, wherein forming a diffusive prism filmon a substrate comprising following steps: coating a consolidated layeron the substrate; forming micro structures on the consolidated layer viahot embossing and consolidating the consolidated layer; coating adecorative film on the consolidated layer and forming micro structureson the decorative film, wherein the decorative film contains diffusiveparticles; and coating an adhesive layer on the decorative film.
 5. Themethod of claim 4, wherein separating the light guide body from thefirst mold and the second mold comprising: separating the substrate andthe consolidated layer from the decorative film of the diffusive prismfilm.
 6. The method of claim 5, wherein the first mold comprises achannel and a sprue connected between the channel and the mold cavity,the pore size of the sprue greater than the pore size of the channel,the substrate and the diffusive prism film comprising a through holecorresponding to the location of the sprue, the first pressing framecomprising an isolating part corresponding to the location of the sprue,the isolating part comprising a convex pore, the method furthercomprising step: when the first pressing frame is clamping the edges ofthe diffusive prism film, disposing the isolating part of the firstpressing frame at the sprue for connecting the convex pore to thechannel and positioning the isolating part between the sprue and thethrough hole.
 7. The method of claim 6, further comprising step:attaching a reflective film to the second mold and using a secondpressing frame for clamping edges of the reflective film; wherein whenthe light guide body is separated from the second mold, the reflectivefilm is transferred onto a second surface of the light guide body. 8.The method of claim 1, wherein forming a diffusive prism film on asubstrate comprising following steps: coating a consolidated layer onthe substrate; forming micro structures on the consolidated layer viahot embossing and consolidating the consolidated layer; coating adecorative film on the consolidated layer and forming micro structureson the decorative film, wherein the decorative film contains diffusiveparticles; and coating an adhesive layer on the decorative film.
 9. Themethod of claim 8, wherein separating the light guide body from thefirst mold and the second mold comprising: separating the substrate andthe consolidated layer from the decorative film of the diffusive prismfilm.
 10. The method of claim 1, wherein the first mold comprises achannel and a sprue connected between the channel and the mold cavity,the pore size of the sprue greater than the pore size of the channel,the substrate and the diffusive prism film comprising a through holecorresponding to the location of the sprue, the first pressing framecomprising an isolating part corresponding to the location of the sprue,the isolating part comprising a convex pore, the method furthercomprising step: when the first pressing frame is clamping the edges ofthe diffusive prism film, disposing the isolating part of the firstpressing frame at the sprue for connecting the convex pore to thechannel and positioning the isolating part between the sprue and thethrough hole.
 11. The method of claim 10, further comprising step:attaching a reflective film to the second mold and using a secondpressing frame for clamping edges of the reflective film; wherein whenthe light guide body is separated from the second mold, the reflectivefilm is transferred onto a second surface of the light guide body. 12.The method of claim 1, further comprising step: attaching a reflectivefilm to the second mold and using a second pressing frame for clampingedges of the reflective film; wherein when the light guide body isseparated from the second mold, the reflective film is transferred ontoa second surface of the light guide body.
 13. An equipment formanufacturing a light guide plate, comprising: a first mold comprising achannel and a sprue having pore size greater than the pore size of thechannel; a second mold assembled with the first mold such that a moldcavity is formed therebetween, wherein the sprue of the first mold isconnected between the channel and the mold cavity; and a first pressingframe adapted for being assembled to the first mold so as to clamp atransfer film to the first mold, the first pressing frame comprising anisolating part corresponding to the location of the sprue, the isolatingpart comprising a convex pore, the isolating part disposed at the sprueand the convex pore connected to the channel.
 14. The equipment of claim13, further comprising a second pressing frame adapted for beingassembled to the second mold so as to clamp a transfer film to thesecond mold.
 15. A light guide plate, comprising: a light guide bodyhaving a first surface and a second surface; and a diffusive prism filmcontaining diffusive particles, the diffusive prism film comprising anadhesive layer attached to the first surface of the light guide body viaIn-Mold Decoration by Roller (IMR); wherein the diffusive prism filmcomprising micro structures on a surface opposite to the adhesive layer.16. The light guide plate of claim 15, further comprising a reflectivefilm attached to the second surface of the light guide body via In-MoldDecoration by Roller (IMR).
 17. The light guide plate of claim 16,wherein the micro structures on the surface of the diffusive prism filmare isosceles right triangular prisms.
 18. The light guide plate ofclaim 15, wherein the micro structures on the surface of the diffusiveprism film are isosceles right triangular prisms.